Suntour Front derailleur for 50-44-24 crankset

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10-06-22, 07:56 PM

#26

ShannonM

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It looks like you're using a modern triple FD with a half-step + granny triple. This usually doesn't work, because the inner cage plate of the FD is stepped inward to help lift the chain up to the middle ring from the granny. With the small size difference between middle and outer ring, that stepped cage hits the middle ring.

The solution is to use a FD designed for a double crankset. The shift up from the granny will be slow, and won't work under load, but when was the last time you needed a granny-to-middle shift RIGHT NOW!!

--Shannon

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10-06-22, 09:10 PM

#27

79pmooney

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Quote:

Originally Posted by nebelppa

Thanks, all! I was doing some more poking around and realized there are really no vintage derailleurs with a capacity over 40t, so I think I'm gonna go compact double for now (replacing the highest chainring with a guard) and looks like I might need to go to different component set (V-GT only has 36t capacity according to specs). Cheers.

I'm running an AR with a 52-42-24 without issue. (Well the chain may drag a little on the FD cage bolt at the bottom in the small-small. I don't sweat that at all. If it drags and there is a plastic bushing, I simply take the bushing out and replace it with a stack of small washers. Been doing that for decades. Chain's harder than the washers so it doesn't care.

If the capacity is close and you like the FD, go for it and look. I'll bet that beyond a little rubbing in your least often used combo, its just fine.